Patents by Inventor Keisuke Tokunaga
Keisuke Tokunaga has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Publication number: 20240079479Abstract: To reduce defects in an oxide semiconductor film in a semiconductor device. To improve the electrical characteristics and the reliability of a semiconductor device including an oxide semiconductor film. In a semiconductor device including a transistor including a gate electrode formed over a substrate, a gate insulating film covering the gate electrode, a multilayer film overlapping with the gate electrode with the gate insulating film provided therebetween, and a pair of electrodes in contact with the multilayer film, a first oxide insulating film covering the transistor, and a second oxide insulating film formed over the first oxide insulating film, the multilayer film includes an oxide semiconductor film and an oxide film containing In or Ga, the first oxide insulating film is an oxide insulating film through which oxygen is permeated, and the second oxide insulating film is an oxide insulating film containing more oxygen than that in the stoichiometric composition.Type: ApplicationFiled: November 13, 2023Publication date: March 7, 2024Inventors: Junichi KOEZUKA, Yukinori SHIMA, Hajime TOKUNAGA, Toshinari SASAKI, Keisuke MURAYAMA, Daisuke MATSUBAYASHI
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Publication number: 20220411276Abstract: A zeolite molded article includes 100 parts by weight of zeolite, 35 parts by weight or more and 70 parts by weight or less of clay, 5 parts by weight or more and 40 parts by weight or less of a silica sol and 0.5 parts by weight or more and 10 parts by weight or less of a water-soluble sodium salt, having an abrasion resistance of 90% or more, an angle of repose of 40° or less, an aerated bulk density on the surface of the zeolite molded article of 0.5 kg/L or more, and a sphericity of the zeolite molded article of 1 or more and 3 or less. The zeolite contains at least one type of zeolite having Si/Al2 of 10 or more and 100,000 or less and a moisture adsorption amount of 10 (g/100 g) or less at 25° C. under a relative pressure of 0.5.Type: ApplicationFiled: November 26, 2020Publication date: December 29, 2022Inventors: Yuki OBA, Keisuke TOKUNAGA, Yoju SHIMIZU
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Publication number: 20220362739Abstract: A high-strength zeolite molding includes 10 parts by weight or more and 40 parts by weight or less of clay relative to 100 parts by weight of zeolite, and having a compressive strength of 20 N or more, in which the zeolite contains at least one zeolite that has Si/Al2 of 300 or more and 100000 or less and a water adsorption amount of 10 (g/100 g) or less under conditions of 25° C. and a relative pressure of 0.5, and the clay contains at least one clay that has a solid acidity of 0.15 mmol/g or less as determined by a NH3-TPD method. A method for producing includes kneading, molding, drying and disintegrating a product and then firing at 400° C. or higher and 700° C. or lower.Type: ApplicationFiled: June 17, 2020Publication date: November 17, 2022Inventors: Yuki OBA, Keisuke TOKUNAGA
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Patent number: 11471855Abstract: The present invention provides a composition that includes a silicotitanate that has a sitinakite structure, the composition having higher cesium adsorptivity than conventional compositions. The present invention also provides a production method for the composition that includes a silicotitanate that has a sitinakite structure. The production method does not require the use of hazardous or deleterious materials, can generate a product using a compound that is easily acquired, and can use a general-purpose autoclave. Also provided is a silicotitanate composition that has higher strontium adsorptivity than the present invention. Provided is a silicotitanate composition that contains niobium and a silicotitanate that has a sitinakite structure, the composition having at least two or more diffraction peaks selected from the group consisting of 2?=8.8°±0.5°, 2?=10.0°±0.5°, and 2?=29.6°±0.5°.Type: GrantFiled: January 3, 2019Date of Patent: October 18, 2022Assignee: TOSOH CORPORATIONInventors: Yoju Shimizu, Hajime Funakoshi, Keisuke Tokunaga, Shigeru Hirano, Takashi Sakuma, Makoto Komatsu, Takeshi Izumi
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Patent number: 11110430Abstract: The present invention provides a treatment method of a radioactive iodine-containing fluid, comprising passing the radioactive iodine-containing fluid through an adsorbent for iodine consisting of a silver-containing binderless zeolite molded body having a silver content of 50 mass % or less, to adsorb the radioactive iodine on the adsorbent for iodine.Type: GrantFiled: February 23, 2017Date of Patent: September 7, 2021Assignees: EBARA CORPORATION, TOSOH CORPORATIONInventors: Takashi Sakuma, Makoto Komatsu, Takeshi Izumi, Keisuke Tokunaga, Shigeru Hirano
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Patent number: 11065597Abstract: A xenon adsorbent capable of efficiently adsorbing xenon, even at a low concentration, from a mixture gas is Provided. A xenon adsorbent comprising a zeolite having a pore size in the range of 3.5 to 5 ? and a silica alumina molar ratio in the range of 10 to 30.Type: GrantFiled: December 26, 2017Date of Patent: July 20, 2021Assignee: TOSOH CORPORATIONInventors: Shigeru Hirano, Keisuke Tokunaga, Hiroshi Okaniwa, Megu Fukui
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Patent number: 10603652Abstract: Provided are: a silver-carrying zeolite molded article in which aggregation of silver is inhibited and which has excellent capability of dispersing silver, when compared to conventional silver-carrying zeolite molded articles; and a method for producing the silver-carrying zeolite molded article. In the silver-carrying zeolite molded article, the molar ratio of Si/Al2 is 2.0-3.0, the molar ratio of (alkali metal+Ag)/Al is 0.9-1.1, the total amount of SiO2, Al2O3, Ag2O, and alkali metal oxides is 90 wt % or more, the contained amount of silver ions is 5 wt % or more, and only a single type of zeolite is contained. The molded article can be produced by subjecting a zeolite molded article having zeolite purity of 90% or more to an ion exchange treatment using a silver-containing aqueous solution.Type: GrantFiled: February 23, 2017Date of Patent: March 31, 2020Assignee: TOSOH CORPORATIONInventors: Keisuke Tokunaga, Shigeru Hirano, Yoju Shimizu, Hajime Funakoshi
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Publication number: 20190336938Abstract: A xenon adsorbent capable of efficiently adsorbing xenon, even at a low concentration, from a mixture gas is Provided. A xenon adsorbent comprising a zeolite having a pore size in the range of 3.5 to 5 ? and a silica alumina molar ratio in the range of 10 to 30.Type: ApplicationFiled: December 26, 2017Publication date: November 7, 2019Applicant: TOSOH CORPORATIONInventors: Shigeru HIRANO, Keisuke TOKUNAGA, Hiroshi OKANIWA, Megu FUKUI
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Patent number: 10343136Abstract: The present invention provides a composition that includes a silicotitanate that has a sitinakite structure, the composition having higher cesium adsorptivity than conventional compositions. The present invention also provides a production method for the composition that includes a silicotitanate that has a sitinakite structure. The production method does not require the use of hazardous or deleterious materials, can generate a product using a compound that is easily acquired, and can use a general-purpose autoclave. Also provided is a silicotitanate composition that has higher strontium adsorptivity than the present invention. Provided is a silicotitanate composition that contains niobium and a silicotitanate that has a sitinakite structure, the composition having at least two or more diffraction peaks selected from the group consisting of 2?=8.8°±0.5°, 2?=10.0°±0.5°, and 2?=29.6°±0.5°.Type: GrantFiled: July 17, 2015Date of Patent: July 9, 2019Assignee: TOSOH CORPORATIONInventors: Yoju Shimizu, Hajime Funakoshi, Keisuke Tokunaga, Shigeru Hirano
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Publication number: 20190134599Abstract: The present invention provides a composition that includes a silicotitanate that has a sitinakite structure, the composition having higher cesium adsorptivity than conventional compositions. The present invention also provides a production method for the composition that includes a silicotitanate that has a sitinakite structure. The production method does not require the use of hazardous or deleterious materials, can generate a product using a compound that is easily acquired, and can use a general-purpose autoclave. Also provided is a silicotitanate composition that has higher strontium adsorptivity than the present invention. Provided is a silicotitanate composition that contains niobium and a silicotitanate that has a sitinakite structure, the composition having at least two or more diffraction peaks selected from the group consisting of 2?=8.8°±0.5°, 2?=10.0°±0.5°, and 2?=29.6°±0.5°.Type: ApplicationFiled: January 3, 2019Publication date: May 9, 2019Applicants: TOSOH CORPORATION, EBARA CORPORATIONInventors: Yoju SHIMIZU, Hajime FUNAKOSHI, Keisuke TOKUNAGA, Shigeru HIRANO, Takashi SAKUMA, Makoto KOMATSU, Takeshi IZUMI
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Publication number: 20190060864Abstract: The present invention provides a treatment method of a radioactive iodine-containing fluid, comprising passing the radioactive iodine-containing fluid through an adsorbent for iodine consisting of a silver-containing binderless zeolite molded body having a silver content of 50 mass % or less, to adsorb the radioactive iodine on the adsorbent for iodine.Type: ApplicationFiled: February 23, 2017Publication date: February 28, 2019Applicants: Ebara Corporation, Tosoh CorporationInventors: Takashi SAKUMA, Makoto KOMATSU, Takeshi IZUMI, Keisuke TOKUNAGA, Shigeru HIRANO
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Publication number: 20190046950Abstract: Provided are: a silver-carrying zeolite molded article in which aggregation of silver is inhibited and which has excellent capability of dispersing silver, when compared to conventional silver-carrying zeolite molded articles; and a method for producing the silver-carrying zeolite molded article. In the silver-carrying zeolite molded article, the molar ratio of Si/Al2 is 2.0-3.0, the molar ratio of (alkali metal+Ag)/Al is 0.9-1.1, the total amount of SiO2, Al2O3, Ag2O, and alkali metal oxides is 90 wt % or more, the contained amount of silver ions is 5 wt % or more, and only a single type of zeolite is contained. The molded article can be produced by subjecting a zeolite molded article having zeolite purity of 90% or more to an ion exchange treatment using a silver-containing aqueous solution.Type: ApplicationFiled: February 23, 2017Publication date: February 14, 2019Applicant: TOSOH CORPORATIONInventors: Keisuke TOKUNAGA, Shigeru HIRANO, Yoju SHIMIZU, Hajime FUNAKOSHI
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Publication number: 20170165634Abstract: The present invention provides a composition that includes a silicotitanate that has a sitinakite structure, the composition having higher cesium adsorptivity than conventional compositions. The present invention also provides a production method for the composition that includes a silicotitanate that has a sitinakite structure. The production method does not require the use of hazardous or deleterious materials, can generate a product using a compound that is easily acquired, and can use a general-purpose autoclave. Also provided is a silicotitanate composition that has higher strontium adsorptivity than the present invention. Provided is a silicotitanate composition that contains niobium and a silicotitanate that has a sitinakite structure, the composition having at least two or more diffraction peaks selected from the group consisting of 2?=8.8°±0.5°, 2?=10.0°±0.5°, and 2?=29.6°±0.5°.Type: ApplicationFiled: July 17, 2015Publication date: June 15, 2017Applicant: TOSOH CORPORATIONInventors: Yoju SHIMIZU, Hajime FUNAKOSHI, Keisuke TOKUNAGA, Shigeru HIRANO
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Patent number: 9675935Abstract: The invention relates to: a ?-type iron silicate which has a fluorine content not more than 400 ppm by weight on a dry basis and in which the crystal grains have a truncated square bipyramidal morphology in an examination with a scanning electron microscope and the whole or part of the iron is contained in the ?-type framework structure, and a process for producing the iron silicate; anther ?-type iron silicate, and a process for producing the iron silicate; and a nitrogen oxide removal catalyst containing the other ?-type iron silicate, a process for producing the catalyst, and a method for nitrogen oxide removal with the catalyst.Type: GrantFiled: December 21, 2010Date of Patent: June 13, 2017Assignee: TOSOH CORPORATIONInventors: Yusuke Naraki, Keisuke Tokunaga, Ko Ariga
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Patent number: 9138685Abstract: An SCR catalyst including iron-containing ?-type zeolite has high NOx reducing performance at a high temperature in the presence of a reducing agent, but does not have the sufficient reducing performance at a low temperature (not higher than 200° C.). A high NOx reduction rate of at least 45% at a temperature not higher than 200° C. is achieved by an SCR catalyst containing iron-containing ?-type zeolite having a full width at half maximum (FWHM) on the X-ray crystal diffraction (302) plane of from 0.28 to 0.34° and a weight loss on heating to 900° C. after hydration treatment of from 15.0 to 18.0% by weight. The SCR catalyst can be manufactured by calcining iron-containing ?-type zeolite at 700 to 850° C. under an atmosphere of a water vapor concentration of not more than 5% by volume.Type: GrantFiled: August 25, 2010Date of Patent: September 22, 2015Assignee: TOSOH CORPORATIONInventor: Keisuke Tokunaga
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Patent number: 9061241Abstract: An SCR catalyst using a ?-zeolite in which the molar ratio of SiO2/Al2O3 is from 20 to less than 40, the particle diameter determined by SEM is 0.35 ?m or more, the full width at half maximum (FWHM) of the X-ray diffraction peak for (302) is less than 0.30°, and the amount of adsorbed NH3 is 1 mmol/g or more, or has an amount of adsorbed NH3 following hydrothermal aging of 0.4 mmol/g or more, demonstrates high catalytic activity for NOx reduction at low temperatures following hydrothermal aging while also demonstrating a low level of discharge of irritating ammonia in exhaust gas.Type: GrantFiled: March 14, 2007Date of Patent: June 23, 2015Assignee: TOSOH CORPORATIONInventors: Keisuke Tokunaga, Hiroshi Ogawa, Ko Ariga, Hidekazu Aoyama
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Patent number: 8795626Abstract: A chabazite-type zeolite having copper and an alkali earth metal supported thereon. The alkali earth metal is preferably at least one metal selected from the group consisting of calcium, magnesium and barium. Moreover, the SiO2/Al2O3 molar ratio is preferably from 10 to 50, and the copper/aluminum atomic ratio is preferably from 0.15 to 0.25. This type of chabazite-type zeolite exhibits a higher nitrogen oxide purification rate after a hydrothermal durability treatment than those of conventional chabazite-type zeolite catalysts on which only copper is supported.Type: GrantFiled: December 27, 2011Date of Patent: August 5, 2014Assignee: Tosoh CorporationInventors: Keisuke Tokunaga, Yuuki Ito
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Publication number: 20130272937Abstract: A chabazite-type zeolite having copper and an alkali earth metal supported thereon. The alkali earth metal is preferably at least one metal selected from the group consisting of calcium, magnesium and barium. Moreover, the SiO2/Al2O3 molar ratio is preferably from 10 to 50, and the copper/aluminum atomic ratio is preferably from 0.15 to 0.25. This type of chabazite-type zeolite exhibits a higher nitrogen oxide purification rate after a hydrothermal durability treatment than those of conventional chabazite-type zeolite catalysts on which only copper is supported.Type: ApplicationFiled: December 27, 2011Publication date: October 17, 2013Applicant: TOSOH CORPORATIONInventors: Keisuke Tokunaga, Yuuki Ito
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Publication number: 20120207669Abstract: The invention relates to: a ?-type iron silicate which has a fluorine content not more than 400 ppm by weight on a dry basis and in which the crystal grains have a truncated square bipyramidal morphology in an examination with a scanning electron microscope and the whole or part of the iron is contained in the ?-type framework structure, and a process for producing the iron silicate; anther ?-type iron silicate, and a process for producing the iron silicate; and a nitrogen oxide removal catalyst containing the other ?-type iron silicate, a process for producing the catalyst, and a method for nitrogen oxide removal with the catalyst.Type: ApplicationFiled: December 21, 2010Publication date: August 16, 2012Applicant: TOSOH CORPORATIONInventors: Yusuke Naraki, Keisuke Tokunaga, Ko Ariga
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Publication number: 20120141370Abstract: An SCR catalyst including iron-containing ?-type zeolite has high NOx reducing performance at a high temperature in the presence of a reducing agent, but does not have the sufficient reducing performance at a low temperature (not higher than 200° C.). A high NOx reduction rate of at least 45% at a temperature not higher than 200° C. is achieved by an SCR catalyst containing iron-containing ?-type zeolite having a full width at half maximum (FWHM) on the X-ray crystal diffraction (302) plane of from 0.28 to 0.34° and a weight loss on heating to 900° C. after hydration treatment of from 15.0 to 18.0% by weight. The SCR catalyst can be manufactured by calcining iron-containing ?-type zeolite at 700 to 850° C. under an atmosphere of a water vapor concentration of not more than 5% by volume.Type: ApplicationFiled: August 25, 2010Publication date: June 7, 2012Applicant: TOSOH CORPORATIONInventor: Keisuke Tokunaga